Photonic Generation of 60 GHz Millimeter-Wave by Frequency Quadrupling Based on a Mode-Locking SOA Fiber Ring Laser with a Low Modulation Depth MZM

Photonic Generation of 60 GHz Millimeter-Wave by Frequency Quadrupling Based on a Mode-Locking SOA Fiber Ring Laser with a Low Modulation Depth MZM

Multi-format signal generation using a frequency-tunable optoelectronic oscillator

A novel photonic approach for multi-format signal generation based on a frequency-tunable optoelectronic oscillator (OEO) is proposed using a dual-polarization quadrature phase shift-keying (DP-QPSK) modulator. The upper dual-parallel Mach-Zehnder modulator (DP-MZM) integrated in the DP-QPSK modulator is properly biased to serve as an equivalent phase modulator, which functions in conjunction with a phase-shifted fiber Bragg grating (PS-FBG) in the OEO loop as a high-Q microwave photonic band-pa

Photonic generation of background-free millimeter-wave ultra-wideband signals (Invited Paper)

We review the recent progress of photonic generation of millimeter wave (MMW)-ultra-wideband (UWB) signals. To fully satisfy the standard defined by the Federal Communications Commission (FCC), the baseband signal (background signal) and the residual local oscillator (LO) signal should be well controlled. We discuss several schemes in this work for generating background-free MMW-UWB signals that are fully compliant with the FCC requirement.

Optically-controlled high-speed terahertz wave modulator based on nonlinear photonic crystals

Optically-controlled high-speed terahertz wave modulator based on nonlinear photonic crystals

Photonic aided vector millimeter-wave signal generation without digital-to-analog converter

A novel scheme of photonic aided vector millimeter-wave (mm-wave) signal generation without a digital-to-analog converter (DAC) is proposed. Based on our scheme, a 20 Gb/s 4-ary quadrature amplitude modulation (4-QAM) mm-wave signal is generated without using a DAC. The experiment results demonstrate that the bit error rate (BER) of 20 Gb/s 4-QAM mm-wave signal can reach below the hard-decision forward-error-correction threshold after a delivery over 1 m wireless distance. Because the DAC is not

Photonic generation of amplitude- and phase-modulated microwave signals with frequency and modulation bit-rate tunability

A photonic approach for the generation of an amplitude- and phase-modulated microwave signal with tunable frequency and modulation bit-rate is proposed and demonstrated. Two coherent optical wavelengths are generated based on external modulation by biasing a Mach–Zehnder modulator (MZM) at the minimum transmission point to generate ±1-order optical sidebands while suppressing the optical carrier. The two sidebands are sent to a circulator and are then spectrally separated by a fiber Bragg gratin

Design of a Photonic Crystal Waveguide for Terahertz-Wave Difference-Frequency Generation

Design of a Photonic Crystal Waveguide for Terahertz-Wave Difference-Frequency Generation

Photonic crystal rod-based high-performance ultrafast fiber laser system

In this paper, we innovatively conduct a Porro prism-based beam pointing stability promotion technique research and realize a high-performance rod-type photonic crystal fiber-based chirped pulse amplification (CPA) system, mainly including a frequency-reduced all-fiber pre-amplification stage, photonic crystal rod-based main amplification stage, and 1600 lines/mm transmission grating-pair compressor. Laser output with average power of 50 W, repetition rates of 500 kHz, pulse energy of 100 μJ, pu

Photonic Crystal Fibers---Properties and Applications

Photonic crystal fibers, also known as microstructured or holey fibers, have recently generated great interest in the scientific community thanks to the new ways provided to control and guide light, not obtainable with conventional optical fibers. Proposed for the first time in early 90’s, photonic crystal fibers have driven an exciting and irrepressible research activity all over the world, starting in the telecommunication field and then touching metrology, spectroscopy, microscopy, astronomy, micromachining, biology and sensing

Frequency response measurement of high-speed electro-optic phase modulators via a single scan based on low-speed photonic sampling and low-frequency detection

Frequency response measurement of high-speed electro-optic phase modulators via a single scan based on low-speed photonic sampling and low-frequency detection

Simple photonic-assisted radio frequency down-converter based on optoelectronic oscillator

A photonic-assisted radio frequency (RF) down-converter integrating with the optoelectronic oscillator (OEO)-based high quality local oscillator (LO) has been proposed and experimentally demonstrated. The LO and the RF input signal are mixed at the same phase modulator and photo-detector (PD) of the OEO-loop without any additional modulator or PD. The working bandwidth of the proposed RF down-converter is nearly from 2.5 to 10 GHz. The performance of the proposed down-converter is presented and

Concurrent photonic measurement of angle-of-arrival and chirp rate of microwave LFM signal

A photonic approach to concurrently measure the angle-of-arrival (AOA) and the chirp rate of a linear frequency modulated (LFM) signal is proposed and experimentally demonstrated. The measurement is achieved by estimating the differential frequency of a two-tone signal output by a dual-parallel Mach–Zehnder modulator and an additional asymmetry Mach–Zehnder interferometer. Experiments show that the AOA and the chirp rate are measured simultaneously, with an AOA measurement error of

Photonic generation of microwave signal using a dual-wavelength erbium-doped fiber ring laser with CMFBG filter and saturable absorber

Photonic generation of microwave signal using a dual-wavelength erbium-doped fiber ring laser with CMFBG filter and saturable absorber

Photonic-Assisted Multi-Frequency Phase-Coded Microwave Signal Generation

Photonic-Assisted Multi-Frequency Phase-Coded Microwave Signal Generation

Frequency-octupled phase-coded signal generation based on carrier-suppressed high-order double sideband modulation

An approach for photonic generation of a frequency-octupled phase-coded signal based on carrier-suppressed high-order double sideband modulation is proposed and experimentally demonstrated. The key component of the scheme is an integrated dual-polarization quadrature phase shift keying modulator, which is used to achieve the carrier-suppressed high-order double sideband modulation. At the output of the modulator, two fourth-order optical sidebands are generated with the optical carrier suppresse

A wideband photonic microwave phase shifter with 360-degree phase tunable range based on a DP-QPSK modulator

A novel wideband photonic microwave phase shifter with 360-degree phase tunable range is proposed based on a single dual-polarization quadrature phase shift-keying (DP-QPSK) modulator. The two dual-parallel Mach-Zehnder modulators (DP-MZMs) in the DP-QPSK modulator are properly biased to serve as a carrier-suppressed single-sideband (CS-SSB) modulator and an optical phase shifter (OPS), respectively. The microwave signal is applied to the CS-SSB modulator, while a control direct-current (DC) vol

Photonic Generation of Triangular-shaped Waveform Based on External Modulation

Photonic Generation of Triangular-shaped Waveform Based on External Modulation

Signal-to-Noise Ratio of Dispersive Photonic Signal Processors

An exact theory describing the intensity PSD of photonic signal processors based on modulated thermal sources with smooth spectrum, first-order dispersion and intensity-noise-limited direct detection is presented. The theory is applied to the evaluation of the signal-to-noise ratio (SNR) of Microwave Photonic Filters (MPF) and of systems based on Incoherent Frequency-to-Time Mapping (IFTM) and Time-pectrum Convolution (TSC) driven by thermal carriers whose optical spectra (continuous or sliced)is smooth at microwave scales.

Cross-referenced deadband-free microwave frequency measurement with cascaded-four-wave-mixing-based photonic harmonic down-conversion

Cross-referenced deadband-free microwave frequency measurement with cascaded-four-wave-mixing-based photonic harmonic down-conversion